577 lines
24 KiB
C++
577 lines
24 KiB
C++
/*
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* Copyright (c) 2016 SEBASTIEN DERONNE
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Sebastien Deronne <sebastien.deronne@gmail.com>
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*/
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#include "ns3/attribute-container.h"
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#include "ns3/boolean.h"
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#include "ns3/command-line.h"
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#include "ns3/config.h"
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#include "ns3/double.h"
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#include "ns3/enum.h"
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#include "ns3/he-phy.h"
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#include "ns3/internet-stack-helper.h"
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#include "ns3/ipv4-address-helper.h"
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#include "ns3/ipv4-global-routing-helper.h"
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#include "ns3/log.h"
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#include "ns3/mobility-helper.h"
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#include "ns3/multi-model-spectrum-channel.h"
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#include "ns3/neighbor-cache-helper.h"
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#include "ns3/on-off-helper.h"
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#include "ns3/packet-sink-helper.h"
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#include "ns3/packet-sink.h"
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#include "ns3/spectrum-wifi-helper.h"
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#include "ns3/ssid.h"
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#include "ns3/string.h"
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#include "ns3/udp-client-server-helper.h"
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#include "ns3/udp-server.h"
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#include "ns3/uinteger.h"
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#include "ns3/wifi-acknowledgment.h"
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#include "ns3/wifi-static-setup-helper.h"
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#include "ns3/yans-wifi-channel.h"
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#include "ns3/yans-wifi-helper.h"
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#include <algorithm>
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#include <functional>
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// This is a simple example in order to show how to configure an IEEE 802.11ax Wi-Fi network.
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//
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// It outputs the UDP or TCP goodput for every HE MCS value, which depends on the MCS value (0 to
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// 11), the channel width (20, 40, 80 or 160 MHz) and the guard interval (800ns, 1600ns or 3200ns).
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// The PHY bitrate is constant over all the simulation run. The user can also specify the distance
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// between the access point and the station: the larger the distance the smaller the goodput.
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//
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// The simulation assumes a configurable number of stations in an infrastructure network:
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//
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// STA AP
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// * *
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// | |
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// n1 n2
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//
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// Packets in this simulation belong to BestEffort Access Class (AC_BE).
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// By selecting an acknowledgment sequence for DL MU PPDUs, it is possible to aggregate a
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// Round Robin scheduler to the AP, so that DL MU PPDUs are sent by the AP via DL OFDMA.
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE("he-wifi-network");
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int
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main(int argc, char* argv[])
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{
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bool udp{true};
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bool downlink{true};
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bool useRts{false};
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bool use80Plus80{false};
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bool useExtendedBlockAck{false};
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Time simulationTime{"10s"};
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bool staticSetup{true};
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auto clientAppStartTime = Seconds(1);
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meter_u distance{1.0};
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double frequency{5}; // whether 2.4, 5 or 6 GHz
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std::size_t nStations{1};
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std::string dlAckSeqType{"NO-OFDMA"};
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bool enableUlOfdma{false};
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bool enableBsrp{false};
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std::string mcsStr;
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std::vector<uint64_t> mcsValues;
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int channelWidth{-1}; // in MHz, -1 indicates an unset value
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int guardInterval{-1}; // in nanoseconds, -1 indicates an unset value
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uint32_t payloadSize =
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700; // must fit in the max TX duration when transmitting at MCS 0 over an RU of 26 tones
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std::string phyModel{"Yans"};
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double minExpectedThroughput{0.0};
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double maxExpectedThroughput{0.0};
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Time accessReqInterval{0};
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CommandLine cmd(__FILE__);
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cmd.AddValue("staticSetup",
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"Whether devices are configured using the static setup helper",
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staticSetup);
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cmd.AddValue("frequency",
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"Whether working in the 2.4, 5 or 6 GHz band (other values gets rejected)",
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frequency);
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cmd.AddValue("distance",
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"Distance in meters between the station and the access point",
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distance);
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cmd.AddValue("simulationTime", "Simulation time", simulationTime);
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cmd.AddValue("udp", "UDP if set to 1, TCP otherwise", udp);
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cmd.AddValue("downlink",
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"Generate downlink flows if set to 1, uplink flows otherwise",
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downlink);
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cmd.AddValue("useRts", "Enable/disable RTS/CTS", useRts);
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cmd.AddValue("use80Plus80", "Enable/disable use of 80+80 MHz", use80Plus80);
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cmd.AddValue("useExtendedBlockAck", "Enable/disable use of extended BACK", useExtendedBlockAck);
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cmd.AddValue("nStations", "Number of non-AP HE stations", nStations);
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cmd.AddValue("dlAckType",
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"Ack sequence type for DL OFDMA (NO-OFDMA, ACK-SU-FORMAT, MU-BAR, AGGR-MU-BAR)",
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dlAckSeqType);
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cmd.AddValue("enableUlOfdma",
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"Enable UL OFDMA (useful if DL OFDMA is enabled and TCP is used)",
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enableUlOfdma);
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cmd.AddValue("enableBsrp",
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"Enable BSRP (useful if DL and UL OFDMA are enabled and TCP is used)",
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enableBsrp);
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cmd.AddValue(
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"muSchedAccessReqInterval",
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"Duration of the interval between two requests for channel access made by the MU scheduler",
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accessReqInterval);
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cmd.AddValue(
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"mcs",
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"list of comma separated MCS values to test; if unset, all MCS values (0-11) are tested",
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mcsStr);
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cmd.AddValue("channelWidth",
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"if set, limit testing to a specific channel width expressed in MHz (20, 40, 80 "
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"or 160 MHz)",
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channelWidth);
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cmd.AddValue("guardInterval",
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"if set, limit testing to a specific guard interval duration expressed in "
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"nanoseconds (800, 1600 or 3200 ns)",
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guardInterval);
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cmd.AddValue("payloadSize", "The application payload size in bytes", payloadSize);
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cmd.AddValue("phyModel",
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"PHY model to use when OFDMA is disabled (Yans or Spectrum). If 80+80 MHz or "
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"OFDMA is enabled "
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"then Spectrum is automatically selected",
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phyModel);
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cmd.AddValue("minExpectedThroughput",
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"if set, simulation fails if the lowest throughput is below this value",
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minExpectedThroughput);
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cmd.AddValue("maxExpectedThroughput",
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"if set, simulation fails if the highest throughput is above this value",
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maxExpectedThroughput);
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cmd.Parse(argc, argv);
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if (useRts)
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{
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Config::SetDefault("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue("0"));
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Config::SetDefault("ns3::WifiDefaultProtectionManager::EnableMuRts", BooleanValue(true));
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}
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if (dlAckSeqType == "ACK-SU-FORMAT")
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{
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Config::SetDefault("ns3::WifiDefaultAckManager::DlMuAckSequenceType",
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EnumValue(WifiAcknowledgment::DL_MU_BAR_BA_SEQUENCE));
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}
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else if (dlAckSeqType == "MU-BAR")
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{
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Config::SetDefault("ns3::WifiDefaultAckManager::DlMuAckSequenceType",
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EnumValue(WifiAcknowledgment::DL_MU_TF_MU_BAR));
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}
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else if (dlAckSeqType == "AGGR-MU-BAR")
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{
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Config::SetDefault("ns3::WifiDefaultAckManager::DlMuAckSequenceType",
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EnumValue(WifiAcknowledgment::DL_MU_AGGREGATE_TF));
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}
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else if (dlAckSeqType != "NO-OFDMA")
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{
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NS_ABORT_MSG("Invalid DL ack sequence type (must be NO-OFDMA, ACK-SU-FORMAT, MU-BAR or "
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"AGGR-MU-BAR)");
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}
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if (phyModel != "Yans" && phyModel != "Spectrum")
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{
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NS_ABORT_MSG("Invalid PHY model (must be Yans or Spectrum)");
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}
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if (use80Plus80 || (dlAckSeqType != "NO-OFDMA"))
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{
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// SpectrumWifiPhy is required for 80+80 MHz and OFDMA
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phyModel = "Spectrum";
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}
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double prevThroughput[12] = {0};
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std::cout << "MCS value"
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<< "\t\t"
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<< "Channel width"
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<< "\t\t"
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<< "GI"
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<< "\t\t\t"
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<< "Throughput" << '\n';
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uint8_t minMcs = 0;
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uint8_t maxMcs = 11;
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if (mcsStr.empty())
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{
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for (uint8_t mcs = minMcs; mcs <= maxMcs; ++mcs)
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{
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mcsValues.push_back(mcs);
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}
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}
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else
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{
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AttributeContainerValue<UintegerValue, ',', std::vector> attr;
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auto checker = DynamicCast<AttributeContainerChecker>(MakeAttributeContainerChecker(attr));
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checker->SetItemChecker(MakeUintegerChecker<uint8_t>());
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attr.DeserializeFromString(mcsStr, checker);
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mcsValues = attr.Get();
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std::sort(mcsValues.begin(), mcsValues.end());
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}
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int minChannelWidth = 20;
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int maxChannelWidth = frequency == 2.4 ? 40 : 160;
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if ((channelWidth != -1) &&
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((channelWidth < minChannelWidth) || (channelWidth > maxChannelWidth)))
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{
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NS_FATAL_ERROR("Invalid channel width: " << channelWidth << " MHz");
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}
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if (channelWidth >= minChannelWidth && channelWidth <= maxChannelWidth)
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{
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minChannelWidth = channelWidth;
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maxChannelWidth = channelWidth;
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}
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int minGi = enableUlOfdma ? 1600 : 800;
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int maxGi = 3200;
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if (guardInterval >= minGi && guardInterval <= maxGi)
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{
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minGi = guardInterval;
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maxGi = guardInterval;
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}
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for (const auto mcs : mcsValues)
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{
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uint8_t index = 0;
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double previous = 0;
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for (int width = minChannelWidth; width <= maxChannelWidth; width *= 2) // MHz
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{
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const auto is80Plus80 = (use80Plus80 && (width == 160));
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const std::string widthStr = is80Plus80 ? "80+80" : std::to_string(width);
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const auto segmentWidthStr = is80Plus80 ? "80" : widthStr;
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for (int gi = maxGi; gi >= minGi; gi /= 2) // Nanoseconds
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{
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if (!udp)
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{
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Config::SetDefault("ns3::TcpSocket::SegmentSize", UintegerValue(payloadSize));
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}
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NodeContainer wifiStaNodes;
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wifiStaNodes.Create(nStations);
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NodeContainer wifiApNode;
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wifiApNode.Create(1);
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NetDeviceContainer apDevice;
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NetDeviceContainer staDevices;
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WifiMacHelper mac;
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WifiHelper wifi;
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std::string channelStr("{0, " + segmentWidthStr + ", ");
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StringValue ctrlRate;
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auto nonHtRefRateMbps = HePhy::GetNonHtReferenceRate(mcs) / 1e6;
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std::ostringstream ossDataMode;
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ossDataMode << "HeMcs" << mcs;
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if (frequency == 6)
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{
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ctrlRate = StringValue(ossDataMode.str());
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channelStr += "BAND_6GHZ, 0}";
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Config::SetDefault("ns3::LogDistancePropagationLossModel::ReferenceLoss",
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DoubleValue(48));
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}
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else if (frequency == 5)
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{
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std::ostringstream ossControlMode;
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ossControlMode << "OfdmRate" << nonHtRefRateMbps << "Mbps";
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ctrlRate = StringValue(ossControlMode.str());
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channelStr += "BAND_5GHZ, 0}";
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}
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else if (frequency == 2.4)
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{
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std::ostringstream ossControlMode;
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ossControlMode << "ErpOfdmRate" << nonHtRefRateMbps << "Mbps";
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ctrlRate = StringValue(ossControlMode.str());
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channelStr += "BAND_2_4GHZ, 0}";
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Config::SetDefault("ns3::LogDistancePropagationLossModel::ReferenceLoss",
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DoubleValue(40));
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}
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else
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{
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NS_FATAL_ERROR("Wrong frequency value!");
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}
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if (is80Plus80)
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{
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channelStr += std::string(";") + channelStr;
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}
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wifi.SetStandard(WIFI_STANDARD_80211ax);
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wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(ossDataMode.str()),
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"ControlMode",
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ctrlRate);
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// Set guard interval
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wifi.ConfigHeOptions("GuardInterval", TimeValue(NanoSeconds(gi)));
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Ssid ssid = Ssid("ns3-80211ax");
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if (phyModel == "Spectrum")
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{
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auto spectrumChannel = CreateObject<MultiModelSpectrumChannel>();
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auto lossModel = CreateObject<LogDistancePropagationLossModel>();
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spectrumChannel->AddPropagationLossModel(lossModel);
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SpectrumWifiPhyHelper phy;
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phy.SetPcapDataLinkType(WifiPhyHelper::DLT_IEEE802_11_RADIO);
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phy.SetChannel(spectrumChannel);
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mac.SetType("ns3::StaWifiMac",
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"Ssid",
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SsidValue(ssid),
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"MpduBufferSize",
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UintegerValue(useExtendedBlockAck ? 256 : 64));
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phy.Set("ChannelSettings", StringValue(channelStr));
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staDevices = wifi.Install(phy, mac, wifiStaNodes);
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if (dlAckSeqType != "NO-OFDMA")
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{
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mac.SetMultiUserScheduler("ns3::RrMultiUserScheduler",
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"EnableUlOfdma",
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BooleanValue(enableUlOfdma),
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"EnableBsrp",
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BooleanValue(enableBsrp),
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"AccessReqInterval",
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TimeValue(accessReqInterval));
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}
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mac.SetType("ns3::ApWifiMac",
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"EnableBeaconJitter",
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BooleanValue(false),
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"BeaconGeneration",
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BooleanValue(!staticSetup),
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"Ssid",
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SsidValue(ssid));
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apDevice = wifi.Install(phy, mac, wifiApNode);
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}
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else
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{
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auto channel = YansWifiChannelHelper::Default();
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YansWifiPhyHelper phy;
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phy.SetPcapDataLinkType(WifiPhyHelper::DLT_IEEE802_11_RADIO);
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phy.SetChannel(channel.Create());
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mac.SetType("ns3::StaWifiMac",
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"Ssid",
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SsidValue(ssid),
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"MpduBufferSize",
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UintegerValue(useExtendedBlockAck ? 256 : 64));
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phy.Set("ChannelSettings", StringValue(channelStr));
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staDevices = wifi.Install(phy, mac, wifiStaNodes);
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mac.SetType("ns3::ApWifiMac",
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"EnableBeaconJitter",
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BooleanValue(false),
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"Ssid",
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SsidValue(ssid));
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apDevice = wifi.Install(phy, mac, wifiApNode);
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}
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int64_t streamNumber = 150;
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streamNumber += WifiHelper::AssignStreams(apDevice, streamNumber);
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streamNumber += WifiHelper::AssignStreams(staDevices, streamNumber);
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// mobility.
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MobilityHelper mobility;
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Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();
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positionAlloc->Add(Vector(0.0, 0.0, 0.0));
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positionAlloc->Add(Vector(distance, 0.0, 0.0));
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mobility.SetPositionAllocator(positionAlloc);
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mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
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mobility.Install(wifiApNode);
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mobility.Install(wifiStaNodes);
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if (staticSetup)
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{
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/* static setup of association and BA agreements */
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auto apDev = DynamicCast<WifiNetDevice>(apDevice.Get(0));
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NS_ASSERT(apDev);
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WifiStaticSetupHelper::SetStaticAssociation(apDev, staDevices);
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WifiStaticSetupHelper::SetStaticBlockAck(apDev, staDevices, {0});
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clientAppStartTime = MilliSeconds(1);
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}
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/* Internet stack*/
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InternetStackHelper stack;
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stack.Install(wifiApNode);
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stack.Install(wifiStaNodes);
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streamNumber += stack.AssignStreams(wifiApNode, streamNumber);
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streamNumber += stack.AssignStreams(wifiStaNodes, streamNumber);
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Ipv4AddressHelper address;
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address.SetBase("192.168.1.0", "255.255.255.0");
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Ipv4InterfaceContainer staNodeInterfaces;
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Ipv4InterfaceContainer apNodeInterface;
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staNodeInterfaces = address.Assign(staDevices);
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apNodeInterface = address.Assign(apDevice);
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if (staticSetup)
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{
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/* static setup of ARP cache */
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NeighborCacheHelper nbCache;
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nbCache.PopulateNeighborCache();
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}
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/* Setting applications */
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ApplicationContainer serverApp;
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auto serverNodes = downlink ? std::ref(wifiStaNodes) : std::ref(wifiApNode);
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Ipv4InterfaceContainer serverInterfaces;
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NodeContainer clientNodes;
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for (std::size_t i = 0; i < nStations; i++)
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{
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serverInterfaces.Add(downlink ? staNodeInterfaces.Get(i)
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: apNodeInterface.Get(0));
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clientNodes.Add(downlink ? wifiApNode.Get(0) : wifiStaNodes.Get(i));
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}
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const auto maxLoad =
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HePhy::GetDataRate(mcs, MHz_u{static_cast<double>(width)}, NanoSeconds(gi), 1) /
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nStations;
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if (udp)
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{
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// UDP flow
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uint16_t port = 9;
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UdpServerHelper server(port);
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serverApp = server.Install(serverNodes.get());
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streamNumber += server.AssignStreams(serverNodes.get(), streamNumber);
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serverApp.Start(Seconds(0));
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serverApp.Stop(simulationTime + clientAppStartTime);
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const auto packetInterval = payloadSize * 8.0 / maxLoad;
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for (std::size_t i = 0; i < nStations; i++)
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{
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UdpClientHelper client(serverInterfaces.GetAddress(i), port);
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client.SetAttribute("MaxPackets", UintegerValue(4294967295U));
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client.SetAttribute("Interval", TimeValue(Seconds(packetInterval)));
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client.SetAttribute("PacketSize", UintegerValue(payloadSize));
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ApplicationContainer clientApp = client.Install(clientNodes.Get(i));
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streamNumber += client.AssignStreams(clientNodes.Get(i), streamNumber);
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clientApp.Start(clientAppStartTime);
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clientApp.Stop(simulationTime + clientAppStartTime);
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}
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}
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else
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{
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// TCP flow
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uint16_t port = 50000;
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Address localAddress(InetSocketAddress(Ipv4Address::GetAny(), port));
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PacketSinkHelper packetSinkHelper("ns3::TcpSocketFactory", localAddress);
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serverApp = packetSinkHelper.Install(serverNodes.get());
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streamNumber += packetSinkHelper.AssignStreams(serverNodes.get(), streamNumber);
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serverApp.Start(Seconds(0));
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serverApp.Stop(simulationTime + clientAppStartTime);
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for (std::size_t i = 0; i < nStations; i++)
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{
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OnOffHelper onoff("ns3::TcpSocketFactory", Ipv4Address::GetAny());
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onoff.SetAttribute("OnTime",
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StringValue("ns3::ConstantRandomVariable[Constant=1]"));
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onoff.SetAttribute("OffTime",
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StringValue("ns3::ConstantRandomVariable[Constant=0]"));
|
|
onoff.SetAttribute("PacketSize", UintegerValue(payloadSize));
|
|
onoff.SetAttribute("DataRate", DataRateValue(maxLoad));
|
|
AddressValue remoteAddress(
|
|
InetSocketAddress(serverInterfaces.GetAddress(i), port));
|
|
onoff.SetAttribute("Remote", remoteAddress);
|
|
ApplicationContainer clientApp = onoff.Install(clientNodes.Get(i));
|
|
streamNumber += onoff.AssignStreams(clientNodes.Get(i), streamNumber);
|
|
|
|
clientApp.Start(clientAppStartTime);
|
|
clientApp.Stop(simulationTime + clientAppStartTime);
|
|
}
|
|
}
|
|
|
|
Simulator::Schedule(Seconds(0), &Ipv4GlobalRoutingHelper::PopulateRoutingTables);
|
|
|
|
Simulator::Stop(simulationTime + clientAppStartTime);
|
|
Simulator::Run();
|
|
|
|
// When multiple stations are used, there are chances that association requests
|
|
// collide and hence the throughput may be lower than expected. Therefore, we relax
|
|
// the check that the throughput cannot decrease by introducing a scaling factor (or
|
|
// tolerance)
|
|
auto tolerance = 0.10;
|
|
auto rxBytes = 0.0;
|
|
if (udp)
|
|
{
|
|
for (uint32_t i = 0; i < serverApp.GetN(); i++)
|
|
{
|
|
rxBytes +=
|
|
payloadSize * DynamicCast<UdpServer>(serverApp.Get(i))->GetReceived();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (uint32_t i = 0; i < serverApp.GetN(); i++)
|
|
{
|
|
rxBytes += DynamicCast<PacketSink>(serverApp.Get(i))->GetTotalRx();
|
|
}
|
|
}
|
|
auto throughput = (rxBytes * 8) / simulationTime.GetMicroSeconds(); // Mbit/s
|
|
|
|
Simulator::Destroy();
|
|
|
|
std::cout << +mcs << "\t\t\t" << widthStr << " MHz\t\t"
|
|
<< (widthStr.size() > 3 ? "" : "\t") << gi << " ns\t\t\t" << throughput
|
|
<< " Mbit/s" << std::endl;
|
|
|
|
// test first element
|
|
if (mcs == minMcs && width == 20 && gi == 3200)
|
|
{
|
|
if (throughput * (1 + tolerance) < minExpectedThroughput)
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
}
|
|
// test last element
|
|
if (mcs == maxMcs && width == maxChannelWidth && gi == 800)
|
|
{
|
|
if (maxExpectedThroughput > 0 &&
|
|
throughput > maxExpectedThroughput * (1 + tolerance))
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
}
|
|
// Skip comparisons with previous cases if more than one stations are present
|
|
// because, e.g., random collisions in the establishment of Block Ack agreements
|
|
// have an impact on throughput
|
|
if (nStations == 1)
|
|
{
|
|
// test previous throughput is smaller (for the same mcs)
|
|
if (throughput * (1 + tolerance) > previous)
|
|
{
|
|
previous = throughput;
|
|
}
|
|
else if (throughput > 0)
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
// test previous throughput is smaller (for the same channel width and GI)
|
|
if (throughput * (1 + tolerance) > prevThroughput[index])
|
|
{
|
|
prevThroughput[index] = throughput;
|
|
}
|
|
else if (throughput > 0)
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
}
|
|
index++;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|